cordova之FileTransfer(Permissiondenied)权限导致下载失败简书

在文件上传时&＃xff0c;由于权限问题&＃xff0c;会报错&＃xff08;Permission denied&＃xff09;&＃xff0c;安卓6.0以上会有此问题。
通过 cordova-plugin-android-permissions 这个cordova插件来处理权限的问题。

app自动更新
1.安装插件
cordova plugin add cordova-plugin-file // 文件系统
　cordova plugin add cordova-plugin-file-transfer //文件传输系统
　cordova plugin add cordova-plugin-android-permissions //处理权限
cordova plugin add cordova-plugin-file-opener2 // 文件下载

2.代码

//下载apkfunction downloadFile() {$ionicLoading.show({template: "已经下载&＃xff1a;0%"});var url &＃61; "http://192.168.0.1:8080/myApp.apk"; //可以从服务端获取更新APP的路径var filename &＃61; url.split("/").pop();var targetPath &＃61; cordova.file.externalRootDirectory &＃43; filename; //APP下载存放的路径&＃xff0c;可以使用cordova file插件进行相关配置var trustHosts &＃61; true;var options &＃61; {};$cordovaFileTransfer.download(url, targetPath, options, trustHosts).then(function(result) {// 打开下载下来的APP$cordovaFileOpener2.open(targetPath, &＃39;application/vnd.android.package-archive&＃39;).then(function() {// 成功}, function(err) {// 错误});$ionicLoading.hide();}, function(err) {console.log(err)$ionicLoading.hide();}, function(progress) {//进度&＃xff0c;这里使用文字显示下载百分比$timeout(function() {var downloadProgress &＃61; (progress.loaded / progress.total) * 100;$ionicLoading.show({template: "已经下载&＃xff1a;" &＃43; Math.floor(downloadProgress) &＃43; "%"});if (downloadProgress > 99) {$ionicLoading.hide();}})});
}// 如果下载成功后无法自动打开&＃xff0c;错误 exposed beyond app through Intent.getData() &＃xff0c;是版本不支持&＃xff0c;请修改platforms>android中的AndroidManifest.xml&＃xff0c;尽量保持android:targetSdkVersion版本在24以下&＃xff0c;这个主要影响Android 8.x版本&＃xff0c;
"19" android:targetSdkVersion&＃61;"23" />
// 权限问题
"android.permission.REQUEST_INSTALL_PACKAGES" />//检查权限var permissions &＃61; cordova.plugins.permissions;permissions.hasPermission(permissions.READ_EXTERNAL_STORAGE, checkPermissionCallback, null);function checkPermissionCallback(status) {if (!status.hasPermission) { // 未取得权限var errorCallback &＃61; function() {console.warn(&＃39;Storage permission is not turned on&＃39;);}permissions.requestPermission(permissions.READ_EXTERNAL_STORAGE,function(status) {if (!status.hasPermission) {errorCallback();} else {// continue with downloading/ Accessing operation downloadFile();}},errorCallback);}else{// 取得权限直接执行代码downloadFile();}}